Author: Robert Hyatt
Date: 20:35:14 04/19/00
Go up one level in this thread
On April 19, 2000 at 23:16:04, William Bryant wrote: >On April 19, 2000 at 22:59:04, Robert Hyatt wrote: > >>On April 19, 2000 at 14:44:00, Wayne Lowrance wrote: >> >>>On April 19, 2000 at 13:57:26, Dan Andersson wrote: >>> >>>>>I don't think FPU performance is significant for chess analysis, so the Pentium >>>>>appears to be more suitable in this respect. >>>> >>>>It doesn't follow that the athlon has a substandard integer unit. >>>>Price/Performance ratings favour the Athlon on almost all counts. >>> >>>The latest info on Tom's rates only FPU as superior to Pent III coppermine 1 >>>giz. I can not intrepet the Integer performance out of his test data. Can you ? >>>Thanks. And from the previous thread maybe FPU is _not_ important to chess >>>software, I dunno, have to get the advise from Dr Hyatt or others. >>>Wayne >> >> >>FP performance is meaningless for chess programs... although for bitmappers, >>the mmx instructions would be useful if there was a portable way of accessing >>them... or if we could coax the compilers to emit them to do long long bitwise >>operators... > >Knowing that the IBM PPC processors are not your processor of choice, do you >know >a way to coax the AltiVec processor in the new G4 processors to do long long >bitwise operators. I have looked into this a little bit, and although the bus >and register width is 128 bits wide, it _appers_ to be designed for parallel >operations on 4, 8, 16, 32 and 128 bit data structures. > >I may be missing something. > >An thoughts or comments. > >William >wbryant@ix.netcom.com No idea since I haven't played with one of the machines. But they are definitely good chips, no doubt. Although they are lagging behind in speed. G4 seems good on paper of course... but I have no idea how well the vec stuff is supported by the compilers they have. Seems that _all_ compilers are lagging behind the chip manufacturers by a couple of years... ie if you want mmx on Intel, you do it by hand, which is a shame..
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